Windows System Software -- Consulting, Training, Development -- Unique Expertise, Guaranteed Results


More Info on Driver Writing and Debugging

The free OSR Learning Library has more than 50 articles on a wide variety of topics about writing and debugging device drivers and Minifilters. From introductory level to advanced. All the articles have been recently reviewed and updated, and are written using the clear and definitive style you've come to expect from OSR over the years.

Check out The OSR Learning Library at:

Before Posting...

Please check out the Community Guidelines in the Announcements and Administration Category.

minifilter callbacks and thread/process/object creation callbacks highest IRQL ?

henrik_meidahenrik_meida Member Posts: 44
edited April 4 in NTFSD

Hi everyone,

What is the highest possible IRQL that my minifilter callbacks such is IPR_MJ_CREATE callback, and also the thread/process/object creation callbacks, can be called, in a simple non hardware WDM driver?

for example, we know that driverEntry and driverUnload will be called at PASSIVE_LEVEL, and know that dispatch functions can be called at high as DISPATCH_LEVEL. so what about minifilter callbacks and creation callbacks? I am not using WDF.

Post edited by Peter_Viscarola_(OSR) on


Sign In or Register to comment.

Howdy, Stranger!

It looks like you're new here. If you want to get involved, click one of these buttons!

Upcoming OSR Seminars
OSR has suspended in-person seminars due to the Covid-19 outbreak. But, don't miss your training! Attend via the internet instead!
Developing Minifilters 24 May 2021 Live, Online
Writing WDF Drivers 14 June 2021 Live, Online
Internals & Software Drivers 27 September 2021 Live, Online
Kernel Debugging 15 November 2021 Live, Online